WO2006131406A1 - Device for removing soot particles from an exhaust gas stream - Google Patents

Device for removing soot particles from an exhaust gas stream Download PDF

Info

Publication number
WO2006131406A1
WO2006131406A1 PCT/EP2006/060895 EP2006060895W WO2006131406A1 WO 2006131406 A1 WO2006131406 A1 WO 2006131406A1 EP 2006060895 W EP2006060895 W EP 2006060895W WO 2006131406 A1 WO2006131406 A1 WO 2006131406A1
Authority
WO
WIPO (PCT)
Prior art keywords
channels
honeycomb body
electrode surfaces
adjacent electrode
adjacent
Prior art date
Application number
PCT/EP2006/060895
Other languages
German (de)
French (fr)
Inventor
Carl M. Fleck
Original Assignee
Fleck Carl M
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fleck Carl M filed Critical Fleck Carl M
Priority to DE502006007485T priority Critical patent/DE502006007485D1/en
Priority to EP06725183A priority patent/EP1891310B1/en
Priority to US11/921,423 priority patent/US7776140B2/en
Priority to AT06725183T priority patent/ATE475001T1/en
Publication of WO2006131406A1 publication Critical patent/WO2006131406A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/025—Combinations of electrostatic separators, e.g. in parallel or in series, stacked separators, dry-wet separator combinations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2455—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the whole honeycomb or segments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/247—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2482—Thickness, height, width, length or diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B01D46/249—Quadrangular e.g. square or diamond
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/50—Means for discharging electrostatic potential
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • F01N3/0275—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means using electric discharge means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/28—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a plasma reactor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/18—Exhaust treating devices having provisions not otherwise provided for for improving rigidity, e.g. by wings, ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/10—Residue burned
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/30—Exhaust treatment

Definitions

  • the invention relates to a device for separating soot particles from an exhaust gas flow with a ceramic honeycomb body with exhaust gas flowing through and extending in the longitudinal direction of the honeycomb body channels, said honeycomb body provided with electrodes for generating an electric field, which is respectively oriented transversely to the axis of the channels is, according to the preamble of claim 1.
  • the charged soot particles are deposited in the channels of a honeycomb body with channels open on both sides by an electric field, which is established by electrodes outside the honeycomb body and penetrates into its channels.
  • the strength of this deposition field also results in the development of a very soft electron plasma, which electrochemically oxidizes the carbon black.
  • this system has another feature, namely its high degree of separation. If the soot particles are well charged and the cross-section of the honeycomb body is dimensioned such that a laminar flow can form, at least 98% to 99% of the particles are deposited.
  • known systems of this type cause difficulties in terms of their space requirements, which are particularly in retrofitting.
  • the object of the invention to provide a device for separating soot particles, which avoids these disadvantages.
  • the device should also allow honeycomb bodies whose cross section deviates from a circular or annular shape, a largely homogeneous electric field in the interior of the honeycomb body.
  • honeycomb bodies whose cross section deviates from a circular or annular shape, a largely homogeneous electric field in the interior of the honeycomb body.
  • honeycomb bodies whose cross section deviates from a circular or annular shape, a largely homogeneous electric field in the interior of the honeycomb body.
  • the device should be characterized by high structural stability and resilience.
  • Claim 1 relates to a device for separating soot particles from an exhaust gas flow with a ceramic honeycomb body with exhaust gas flowing through and in the longitudinal direction of the honeycomb body channels, wherein the honeycomb body with electrodes for generating an electric field, which is respectively oriented transversely to the axis of the channels , is provided, it being provided according to the invention that the electrodes are each formed by a group of channels, in each of which at least partially along its axial extent an electrical conductor is introduced.
  • the introduction of a conductor can be done in principle in different ways. For example, the channels of a group of channels representing one electrode can be filled with an electrical conductor over its entire cross-section and over much of its axial extent.
  • the electrodes are each formed by a group of channels whose inner walls are each provided along the axial extent of the channels at least partially with a metallic coating.
  • Methods for coating the inner walls of the channels are known, so the coating can be done about using electrolytic methods.
  • To introduce the electrical conductor in the form of a coating of the channel walls is particularly advantageous because it hardly affects the structural stability and load capacity of the honeycomb body.
  • the electrodes are thus not according to the invention arranged on outer boundary walls of the honeycomb body, but extend in the form of groups of channels in the interior of the honeycomb body, which were each provided with an electrical conductor. Each of these groups defines an electrode, and there are different possibilities of selection for those channels which are to be part of a channel group and thus an electrode.
  • the groups of channels are formed in each case by channels arranged circularly about the longitudinal axis of the honeycomb body, so that a curved, preferably cylindrical, electrode surface is defined by each group of channels.
  • the groups of channels are each formed by adjacent channels, so that a flat electrode surface is defined by each group of channels.
  • the coated inner walls of the channels are in principle three-dimensional arrangements, the cross-section of the channels is very small in comparison to the cross-section of the honeycomb body, so that an electrode formed by a channel group is characterized by a planar electrical conductivity or curved electrode surface can be approximated.
  • the electrode surface may be thought of as being approximately the area defined by the longitudinal axes of the respective channels.
  • the electrode surfaces could also be arranged vertically by selecting channels for coating, which lie one above the other within a channel group forming an electrode.
  • two adjacent electrode surfaces at a distance of less than 40 mm, and according to claim 6 a distance of 15-25 mm.
  • a homogeneous electric field can be ensured even in completely asymmetrical designs of the honeycomb body.
  • the groups of channels are each formed by adjacent channels so that a curved, preferably cylindrical, electrode surface is defined by each group of channels.
  • each case two adjacent electrode surfaces are contacted against each other.
  • the contacting of the respective electrode surface is formed by metal brushes which are inserted into the channels of the respective electrode surface and are provided with an electrical conductor, wherein in each of the channels at least one, preferably a plurality of metal bristles of the brush are inserted.
  • Claim 14 provides that those channels which are located outside of the area of the honeycomb body delimited by in each case two adjacent electrode surfaces are closed at least on the input side. As a result, the degree of separation can be improved, since in this way it is ensured that the exhaust gas flow is conducted only through those channels in which a largely homogeneous electric field exists, that is to say through those channels which are within the space area of the space bounded by two adjacent electrode surfaces Honeycomb body are located.
  • An embodiment of the honeycomb body in which, in particular, the fine structure of the homogeneity of the electric field in the individual channels is improved can be achieved by the features of claim 15, by the clear cross-section of those channels which are within the space area delimited by in each case two adjacent electrode surfaces of the honeycomb body are formed, each rectangular in shape, wherein two normal to the electrode surfaces successive channels are each brick wall-like offset from each other.
  • a further increase in structural stability can be achieved by the measures of claim 16, by Channels which are located outside the space region of the honeycomb body delimited by in each case two adjacent electrode surfaces have a smaller clear cross-section than those channels which are located within the space region of the honeycomb body delimited by in each case two adjacent electrode surfaces.
  • those portions of the honeycomb body which are outside the homogeneous electric field regions, and thus preferably do not contribute to the filtering of particles, are thus made denser and thus contribute to increasing the structural stability of the honeycomb body. It can also be provided according to claim 17, that the clear cross-section of those channels, which are located outside of the space bounded by two adjacent electrode areas of the honeycomb body, is square.
  • those channels which are provided with an electrical conductor have thicker inner walls and a larger clear cross-section than other channels of the honeycomb body.
  • the device according to the invention allows in particular the advantageous embodiments according to claim 19 and 20, namely that the honeycomb body has a convex or trapezoidal circumferential line.
  • Fig. 1 is a schematic representation of a cross section of an embodiment of a device according to the invention, wherein in particular horizontal and mutually parallel electrode surfaces are visible, and
  • Fig. 2 is a detail view of Fig. 1, wherein in particular the arrangement of the channels, as well as the coating of channels of a channel group, which defines an electrode surface, can be seen.
  • honeycomb body 7 each show a schematic representation of a cross section of a honeycomb body 7, preferably made of a ceramic material.
  • a honeycomb body 7 is shown with a convex, namely elliptical circumferential line, but it could also have other cross-sectional shapes, such as a trapezoidal shape.
  • the honeycomb body 7 can be monolithic, or else composed of several sections.
  • the honeycomb body 7 would have a centric, cylindrical bore in which a high voltage electrode is arranged.
  • the counter electrode would be located on the outside of the honeycomb body 7.
  • such a bore is no longer necessary according to the inventive features, instead, the honeycomb body 7, as shown in FIGS. 1 and 2, be structurally uniform.
  • the honeycomb body 7 has channels 3,4,5, which extend in the longitudinal direction of the honeycomb body 7, and are open on both sides on the end faces of the honeycomb body 7.
  • the channels 3,4,5 but also mutually open and closed, so that the exhaust gas flow through an open at the inlet side, but closed at the outlet side channel 3,4,5, and for leaving the honeycomb body 7 by the Inner wall of the respective channel 3,4,5 to the adjacent channel 3,4,5, which is closed at the inlet side, but open at the outlet side, must pass.
  • the invention is in principle suitable for both variants, ie those of the open on both sides, as well as the mutually open channels 3,4,5.
  • the electrodes 1, 2 are each formed by a group of channels 4, in each of which an electrical conductor 6 is introduced at least partially along its axial extent.
  • the electrodes 1, 2 are each formed by a group of channels 4 whose inner walls are at least partially provided with a metallic coating 6 along the axial extent of the channels 4.
  • the coated inner walls of the channels 4 are in principle three-dimensional arrangements, the cross section of the channels 4 is very small compared to the cross section of the honeycomb body 7, so that an electrode formed by a channel group is characterized by a flat electrode surface with respect to its electrical properties 1,2 can be approximated.
  • FIG. 1 the electrodes 1, 2 are each formed by a group of channels 4, in each of which an electrical conductor 6 is introduced at least partially along its axial extent.
  • the electrodes 1, 2 are each formed by a group of channels 4 whose inner walls are at least partially provided with a metallic coating 6 along the axial extent of the channels 4.
  • the cross section of the channels 4 is very small compared to the cross section of the honeycomb body 7, so
  • the groups of channels 4 are each formed by adjacent channels 4, so that a planar electrode surface 1, 2 is defined by each group of channels 4.
  • the electrode surface 1, 2 may be thought of as being approximately the area defined by the longitudinal axes of the respective channels 4.
  • the coating 6 can be produced approximately by electrolytic processes in which a wire is drawn into the channel 4 to be coated, and when a voltage is applied metallic ions of the electrolyte are deposited on the inner wall of the channel 4.
  • metallic coating 6 for example, copper, copper-chromium layers or other conductive substances, which prove to be suitable in the manufacture and operation of the device according to the invention, may be provided.
  • the flat electrode surfaces 1, 2 each extend horizontally and parallel to one another.
  • the distance between two adjacent electrode surfaces 1 and 2 is preferably less than 40 mm, about 15-25 mm.
  • a homogeneous electric field can be ensured between the electrode surfaces 1 and 2, in particular in those spatial regions which are located within the space region of the honeycomb body 7 delimited by two adjacent electrode surfaces 1, 2, which is also referred to below as a homogeneous field region ,
  • Two adjacent electrode surfaces 1 and 2 are each contacted opposite polarity, wherein in FIG. 1, approximately the electrode surface 1 is grounded, and the electrode surface 2 is supplied with pulsed high voltage.
  • the device according to the invention is also applicable to embodiments in which a DC voltage is supplied to the electrode surface 2.
  • the honeycomb body 7 electrical contacts (not shown in FIGS. 1 and 2) of the electrode surfaces 1 are arranged, wherein the electrical contacting of the respectively adjacent electrode surfaces 2 is preferably located on the opposite end side of the honeycomb body 7.
  • the contacting of the respective electrode surface 1, 2 is carried out by metallically coated electrodes assigned to the respective electrode surface 1, 2 Channels 4 inserted metal brushes formed, wherein in each of the channels 4 at least one, preferably a plurality of metal bristles of the brush are inserted.
  • the end of a metallically coated channel 4 facing the contacting prefferably, has an uncoated end region which extends over an axial region of at least 10-20 mm extends.
  • the contacting of each opposite end of a provided with an electrical conductor 6 channel 4 is closed.
  • those channels 3 that are outside the homogeneous field area may have a smaller clear cross-section than those channels 4, 5 that are within the homogeneous field area, so that the honeycomb body 7 has a denser structure in these areas.
  • the clear cross section of these channels 3, which are located outside the homogeneous field area can also be made square, which additionally increases their structural strength.
  • Those channels 4, which are provided with a metallic coating 6, may have thicker inner walls and a larger clear cross-section than all other channels 3,5 of the honeycomb body 7.
  • the clear cross-section of those channels 5 which are located within the homogeneous field region can each have a rectangular shape be formed, wherein two normal to the electrode surfaces 1,2 successive channels 5 are each brick wall-like offset from each other.
  • This embodiment of the honeycomb body improves in particular the fine structure of the homogeneity of the electric field in the individual channels.
  • Those channels 3, which are located outside the homogeneous field region of the honeycomb body 7, can also be closed on the input side, optionally also on the output side. Thereby, the degree of separation can be improved, since in this way it is ensured that the exhaust gas flow is conducted only through those channels 5 in which a largely homogeneous electric field exists.
  • a filter for separating soot particles is thus realized, which also enables a largely homogeneous electric field in the interior of the honeycomb body 7 even with honeycomb bodies 7 whose cross section deviates from a circular or annular shape. Furthermore, there are no restrictions on the size of the honeycomb body 7, since, depending on the size of the honeycomb body 7, an adapted number of electrode surfaces 1, 2 can be provided.
  • the device is characterized by high structural stability and resilience.

Abstract

The invention concerns a device for removing soot particles from an exhaust gas stream, with a ceramic honey-combed body (7) with channels (3,4,5) through which the exhaust gas can flow extending in the longitudinal direction of the honeycomb body, the honeycomb body (7) being provided with electrodes for generating an electric field that is oriented transversally to the axis of the channels (3,4,5). According to the invention, the electrodes are each formed by a group of channels (4), into each of which is introduced an electric conductor (6) at least partly along the axial extension of the channels. The electric conductor is preferably a metallic coating (6).

Description

Vorrichtung zum Abscheiden von Russpartikel aus einem AbqasstromDevice for separating soot particles from an Abqasstrom
Die Erfindung betrifft eine Vorrichtung zum Abscheiden von Russpartikel aus einem Abgasstrom mit einem keramischen Wabenkörper mit vom Abgas durchströmbaren und in Längsrichtung des Wabenkörpers verlaufenden Kanälen, wobei der Wabenkörper mit Elektroden zur Erzeugung eines elektrischen Feldes, das jeweils quer zur Achse der Kanäle orientiert ist, versehen ist, gemäß dem Oberbegriff von Anspruch 1.The invention relates to a device for separating soot particles from an exhaust gas flow with a ceramic honeycomb body with exhaust gas flowing through and extending in the longitudinal direction of the honeycomb body channels, said honeycomb body provided with electrodes for generating an electric field, which is respectively oriented transversely to the axis of the channels is, according to the preamble of claim 1.
Gemäß dem Stand der Technik sind verschiedene Ausführungsformen solcher Vorrichtungen zum Abscheiden von Russpartikel, die im Folgenden auch als Filter bzw. als Dieselpartikelfilter bezeichnet werden, bekannt. Die Nachrüstung von Dieselpartikelfiltern fokussiert sich dabei immer mehr auf plasmaregenerierte Filtersysteme, insbesondere mit beidseitig offenen Kanälen, die wahrscheinlich als einzige eine Regeneration des Filters bei Temperaturen unter 2000C, sehr oft auch bis zu unter 15O0C, gewährleisten können. Systeme dieser Art werden etwa in den Patentschriften EP 0 880 642 Bl, EP 0 332 609 Bl, EP 0 537 217 Bl, EP 0 885 647 Bl und A 1866/2004 beschrieben. Dabei werden die aufgeladenen Russpartikel in den Kanälen eines Wabenkörpers mit beidseitig offenen Kanälen durch ein elektrisches Feld abgeschieden, das durch Elektroden außerhalb des Wabenkörpers errichtet wird und in seine Kanäle eindringt. Durch die Stärke dieses Abscheidefeldes entwickelt sich auch ein sehr weiches Elektronenplasma, das den Russ elektrochemisch oxidiert. Neben der tiefen Regenerationstemperatur besitzt dieses System noch eine weitere Eigenschaft, nämlich ihren hohen Abscheidegrad. Werden die Russpartikel gut aufgeladen und ist der Querschnitt des Wabenkörpers so bemessen, dass sich eine laminare Strömung ausbilden kann, werden immerhin 98% bis 99% der Partikel abgeschieden . Allerdings bereiten bekannte Systeme dieser Art Schwierigkeiten hinsichtlich ihres Platzbedarfes, die sich insbesondere bei Nachrüstungen stellen. Um den Wabenkörper einerseits so groß wie möglich auszuführen, andererseits aber möglichst nahe an den Motor heranzukommen, wäre es vorteilhaft, ihn möglichst gut an die Kontur des Unterbodens in Motornähe anzupassen. Damit ergeben sich asymmetrisch elliptische und trapezförmige Querschnitte, in die mit Hilfe außen liegender Elektroden kein hinreichend homogenes elektrisches Feld eingeleitet werden kann, um eine Regeneration durchzuführen.According to the prior art, various embodiments of such devices for the separation of soot particles, which are also referred to below as filters or as diesel particulate filters, are known. The retrofitting of diesel particulate filters is focused always more on plasmaregenerierte filter systems, in particular with both sides open channels, probably as a single regeneration of the filter at temperatures below 200 0 C, and very often up to 15O 0 C under guarantee. Systems of this type are described, for example, in patents EP 0 880 642 B1, EP 0 332 609 B1, EP 0 537 217 B1, EP 0 885 647 B1 and A 1866/2004. In this case, the charged soot particles are deposited in the channels of a honeycomb body with channels open on both sides by an electric field, which is established by electrodes outside the honeycomb body and penetrates into its channels. The strength of this deposition field also results in the development of a very soft electron plasma, which electrochemically oxidizes the carbon black. In addition to the low regeneration temperature, this system has another feature, namely its high degree of separation. If the soot particles are well charged and the cross-section of the honeycomb body is dimensioned such that a laminar flow can form, at least 98% to 99% of the particles are deposited. However, known systems of this type cause difficulties in terms of their space requirements, which are particularly in retrofitting. In order to make the honeycomb body as large as possible on the one hand, but on the other hand to get as close to the engine, it would be advantageous to adapt it as well as possible to the contour of the underbody near the engine. This results in asymmetrical elliptical and trapezoidal cross-sections, in which with the help of external electrodes no sufficiently homogeneous electric field can be introduced to perform a regeneration.
Des weiteren zeigt sich bei bekannten Filtersystemen ein weiterer Nachteil: Um mit dem keramischen Wabenkörper in seinem Metallgehäuse, seinem Canning, eine entsprechende Zeitstandsfestigkeit zu erreichen, wird er mit einer Matte aus Steinwolle mit hohem Druck in seine Metallhülle gespannt („gecannt") . Oft wird auch unter Druck die Steinwolle mit Glimmer fixiert, der sich erst bei einer bestimmten Temperatur öffnet, und so den Druck der Matte auf den Wabenkörper seinerseits noch erhöht. Dieser Druck ist notwendig, um den Wabenkörper bei jeder Temperatur und über viele 100.000 km bei jedem Betriebszustand an seinem Platz zu halten. Um diesem hohen Packungsdruck standzuhalten, sind alle Wabenkörper mehr oder weniger rund, oder zumindest stark abgerundet bis elliptisch. Diese Formen ermöglichen durch äußere Elektroden kein auch nur annähernd homogenes elektrisches Feld im Inneren des Wabenkörpers zu errichten.Furthermore, in known filter systems, another disadvantage: In order to achieve a corresponding creep strength with the ceramic honeycomb body in his metal housing, his Canning, he is stretched with a mat of rock wool at high pressure in his metal shell ("scanned") The rock wool is also fixed under pressure with mica, which only opens at a certain temperature, which in turn increases the pressure of the mat on the honeycomb body.This pressure is necessary to keep the honeycomb body at each temperature and for many 100,000 km at each In order to withstand this high packing pressure, all honeycomb bodies are more or less round, or at least strongly rounded to elliptical.These forms make it possible by external electrodes not even approximately homogeneous electric field to build inside the honeycomb body.
Als weiterer Nachteil bekannter Filtersysteme zeigt sich, dass großvolumige Dieselmotore, insbesondere Dieselmotore für Lastkraftwagen, Baumaschinen, Schiffsmotore und dergleichen, auch Wabenkörper mit sehr großen Querschnitten benötigen. Dem steht entgegen, dass bei einer Anwendung gepulster elektrischer Felder (siehe etwa Patentschriften EP 1 229 992 Bl oder A 1866/2004) der maximale Elektrodenabstand etwa 30 mm bis 40 mm, vorzugsweise 20 mm, betragen kann. Dieser maximal mögliche Elektrodenabstand beschränkt die ausführbare Größe der Wabenkörper .Another disadvantage of known filter systems shows that large-volume diesel engines, especially diesel engines for trucks, construction machinery, marine engines and the like, also need honeycomb body with very large cross-sections. This is contrary to the fact that in an application pulsed electrical Fields (see, for example, patent EP 1 229 992 Bl or A 1866/2004), the maximum electrode spacing about 30 mm to 40 mm, preferably 20 mm, may be. This maximum possible electrode spacing limits the executable size of the honeycomb body.
Es ist daher das Ziel der Erfindung eine Vorrichtung zum Abscheiden von Russpartikel zu schaffen, die diese Nachteile vermeidet. Insbesondere soll die Vorrichtung auch bei Wabenkörper, deren Querschnitt von einer kreis- bzw. kreisringförmigen Form abweicht, ein weitestgehend homogenes elektrisches Feld im Inneren des Wabenkörpers ermöglichen. Des Weiteren sollen sich keine Beschränkungen hinsichtlich der Größe des Wabenkörpers ergeben. Die Vorrichtung soll sich dabei durch hohe strukturelle Stabilität und Belastbarkeit auszeichnen.It is therefore the object of the invention to provide a device for separating soot particles, which avoids these disadvantages. In particular, the device should also allow honeycomb bodies whose cross section deviates from a circular or annular shape, a largely homogeneous electric field in the interior of the honeycomb body. Furthermore, there should be no restrictions on the size of the honeycomb body. The device should be characterized by high structural stability and resilience.
Diese Ziele werden durch die Merkmale von Anspruch 1 erreicht. Anspruch 1 bezieht sich auf eine Vorrichtung zum Abscheiden von Russpartikel aus einem Abgasstrom mit einem keramischen Wabenkörper mit vom Abgas durchströmbaren und in Längsrichtung des Wabenkörpers verlaufenden Kanälen, wobei der Wabenkörper mit Elektroden zur Erzeugung eines elektrischen Feldes, das jeweils quer zur Achse der Kanäle orientiert ist, versehen ist, wobei erfindungsgemäß vorgesehen ist, dass die Elektroden jeweils durch eine Gruppe von Kanälen, in denen jeweils zumindest teilweise entlang ihrer axialen Erstreckung ein elektrischer Leiter eingebracht ist, gebildet werden. Das Einbringen eines Leiters kann prinzipiell auf unterschiedliche Weise erfolgen. So können etwa die Kanäle einer Kanalgruppe, die eine Elektrode darstellen, über ihren gesamten Querschnitt und über weite Teile ihrer axialen Erstreckung mit einem elektrischen Leiter ausgefüllt sein. Alternativ können aber auch elektrisch leitfähige Drähte, Flachbänder oder Flacheisen in die Kanäle eingeschoben sein, die sich somit nur teilweise über den Querschnitt der Kanäle erstrecken. Vorzugsweise ist gemäß Anspruch 2 aber vorgesehen, dass die Elektroden jeweils durch eine Gruppe von Kanälen gebildet werden, deren Innenwände jeweils entlang der axialen Erstreckung der Kanäle zumindest teilweise mit einer metallischen Beschichtung versehen sind. Verfahren für die Beschichtung der Innenwände der Kanäle sind bekannt, so kann die Beschichtung etwa mithilfe elektrolytischer Methoden erfolgen. Den elektrischen Leiter in Form einer Beschichtung der Kanalwände einzubringen ist insbesondere deshalb vorteilhaft, weil sie die strukturelle Stabilität und Belastbarkeit des Wabenkörpers kaum beeinträchtigt.These objects are achieved by the features of claim 1. Claim 1 relates to a device for separating soot particles from an exhaust gas flow with a ceramic honeycomb body with exhaust gas flowing through and in the longitudinal direction of the honeycomb body channels, wherein the honeycomb body with electrodes for generating an electric field, which is respectively oriented transversely to the axis of the channels , is provided, it being provided according to the invention that the electrodes are each formed by a group of channels, in each of which at least partially along its axial extent an electrical conductor is introduced. The introduction of a conductor can be done in principle in different ways. For example, the channels of a group of channels representing one electrode can be filled with an electrical conductor over its entire cross-section and over much of its axial extent. Alternatively, however, electrically conductive wires, flat strips or flat iron may be inserted into the channels, which thus only partially over the Cross section of the channels extend. Preferably, however, it is provided according to claim 2 that the electrodes are each formed by a group of channels whose inner walls are each provided along the axial extent of the channels at least partially with a metallic coating. Methods for coating the inner walls of the channels are known, so the coating can be done about using electrolytic methods. To introduce the electrical conductor in the form of a coating of the channel walls is particularly advantageous because it hardly affects the structural stability and load capacity of the honeycomb body.
Die Elektroden werden somit erfindungsgemäß nicht an äußeren Begrenzungswänden des Wabenkörpers angeordnet, sondern erstrecken sich in Form von Gruppen von Kanälen im Inneren des Wabenkörpers, die jeweils mit einem elektrischen Leiter versehen wurden. Jede dieser Gruppen definiert dabei eine Elektrode, wobei es unterschiedliche Möglichkeiten der Auswahl für jene Kanäle gibt, die Bestandteil einer Kanalgruppe und somit einer Elektrode sein sollen.The electrodes are thus not according to the invention arranged on outer boundary walls of the honeycomb body, but extend in the form of groups of channels in the interior of the honeycomb body, which were each provided with an electrical conductor. Each of these groups defines an electrode, and there are different possibilities of selection for those channels which are to be part of a channel group and thus an electrode.
So wäre es etwa denkbar, dass die Gruppen von Kanälen jeweils durch kreisförmig um die Längsachse des Wabenkörpers angeordnete Kanäle gebildet werden, sodass durch jede Gruppe von Kanälen eine gekrümmte, vorzugsweise zylindrische, Elektrodenfläche definiert wird. Es kann aber auch gemäß Anspruch 3 vorgesehen sein, dass die Gruppen von Kanälen jeweils durch nebeneinander liegende Kanäle gebildet werden, sodass durch jede Gruppe von Kanälen eine ebene Elektrodenfläche definiert wird. Zwar stellen die beschichteten Innenwände der Kanäle prinzipiell dreidimensionale Anordnungen dar, der Querschnitt der Kanäle ist im Vergleich zum Querschnitt des Wabenkörpers allerdings sehr klein, sodass eine durch eine Kanalgruppe gebildete Elektrode hinsichtlich ihrer elektrischen Eigenschaften durch eine ebene bzw. gekrümmte Elektrodenfläche approximiert werden kann. Im Fall von nebeneinander liegenden Kanälen mit jeweils rechteckigem Querschnitt kann die Elektrodenfläche etwa als jene Fläche gedacht werden, die durch die Längsachsen der jeweiligen Kanäle definiert wird. Gemäß Anspruch 3 ergeben sich somit horizontale Elektrodenflächen, die den Wabenkörper durchziehen, und gemäß Anspruch 4 bevorzugt parallel zueinander verlaufen. Selbstverständlich könnten die Elektrodenflächen aber auch senkrecht angeordnet werden, indem Kanäle zur Beschichtung ausgewählt werden, die innerhalb einer eine Elektrode bildenden Kanalgruppe jeweils übereinander liegen.For example, it would be conceivable for the groups of channels to be formed in each case by channels arranged circularly about the longitudinal axis of the honeycomb body, so that a curved, preferably cylindrical, electrode surface is defined by each group of channels. However, it can also be provided according to claim 3, that the groups of channels are each formed by adjacent channels, so that a flat electrode surface is defined by each group of channels. Although the coated inner walls of the channels are in principle three-dimensional arrangements, the cross-section of the channels is very small in comparison to the cross-section of the honeycomb body, so that an electrode formed by a channel group is characterized by a planar electrical conductivity or curved electrode surface can be approximated. In the case of adjacent channels each having a rectangular cross-section, the electrode surface may be thought of as being approximately the area defined by the longitudinal axes of the respective channels. In accordance with claim 3 thus result in horizontal electrode surfaces, which pass through the honeycomb body, and according to claim 4 preferably parallel to each other. Of course, the electrode surfaces could also be arranged vertically by selecting channels for coating, which lie one above the other within a channel group forming an electrode.
Gemäß Anspruch 5 weisen zwei benachbarte Elektrodenflächen einen Abstand von unter 40 mm auf, und gemäß Anspruch 6 einen Abstand von 15-25 mm. Dadurch kann ein homogenes elektrisches Feld auch in vollkommen asymmetrischen Bauformen des Wabenkörpers sichergestellt werden.According to claim 5, two adjacent electrode surfaces at a distance of less than 40 mm, and according to claim 6 a distance of 15-25 mm. As a result, a homogeneous electric field can be ensured even in completely asymmetrical designs of the honeycomb body.
Gemäß Anspruch 7 kann vorgesehen sein, dass die Gruppen von Kanälen jeweils durch nebeneinander liegende Kanäle gebildet werden, sodass durch jede Gruppe von Kanälen eine gekrümmte, vorzugsweise zylinderförmige, Elektrodenfläche definiert wird.According to claim 7 it can be provided that the groups of channels are each formed by adjacent channels so that a curved, preferably cylindrical, electrode surface is defined by each group of channels.
Gemäß Anspruch 8 ist vorgesehen, dass jeweils zwei benachbarte Elektrodenflächen gegenpolig kontaktiert sind. Das kann gemäß Anspruch 9 etwa erfolgen, indem sich die elektrische Kontaktierung einer Elektrodenfläche an einer Stirnseite des Wabenkörpers befindet, und die elektrische Kontaktierung der jeweils benachbarten Elektrodenflächen an der gegenüberliegenden Stirnseite des Wabenkörpers. Hierzu kann gemäß Anspruch 10 vorzugsweise vorgesehen sein, dass die Kontaktierung der jeweiligen Elektrodenfläche durch in die der betreffenden Elektrodenfläche zugeordneten, mit einem elektrischen Leiter versehenen Kanäle eingeschobene Metallbürsten gebildet wird, wobei in jeder der Kanäle mindestens eine, vorzugsweise mehrere Metallborsten der Bürste eingeschoben sind. Um die Gefahr von Spannnungsüberschlägen zwischen zwei benachbarten Elektrodenflächen zu vermeiden, ist es gemäß Anspruch 11 vorteilhaft, wenn das der Kontaktierung gegenüberliegende Ende eines mit einem elektrischen Leiter versehenen Kanals einen vom Leiter freien Endbereich aufweist, der sich gemäß Anspruch 12 etwa über einen axialen Bereich von zumindest 10-20 mm erstreckt. Zusätzlich kann gemäß Anspruch 13 das der Kontaktierung jeweils gegenüberliegende Ende eines mit einem elektrischen Leiter versehenen Kanals verschlossen sein.According to claim 8 it is provided that in each case two adjacent electrode surfaces are contacted against each other. This can be done according to claim 9, for example, by the electrical contacting of an electrode surface is located on an end face of the honeycomb body, and the electrical contacting of the respective adjacent electrode surfaces on the opposite end side of the honeycomb body. For this purpose, it can be provided according to claim 10 that the contacting of the respective electrode surface is formed by metal brushes which are inserted into the channels of the respective electrode surface and are provided with an electrical conductor, wherein in each of the channels at least one, preferably a plurality of metal bristles of the brush are inserted. In order to avoid the risk of voltage flashovers between two adjacent electrode surfaces, it is advantageous according to claim 11, when the contact opposite end of a channel provided with an electrical conductor has a conductor-free end portion, which according to claim 12 approximately over an axial range of extends at least 10-20 mm. In addition, according to claim 13, the contact of each opposite end of a channel provided with an electrical conductor can be closed.
Anspruch 14 sieht vor, dass jene Kanäle, die sich außerhalb des von jeweils zwei benachbarten Elektrodenflächen begrenzten Raumbereiches des Wabenkörpers befinden, zumindest eingangsseitig verschlossen sind. Dadurch kann der Abscheidegrad verbessert werden, da auf diese Weise sichergestellt wird, dass der Abgasstrom nur durch jene Kanäle geleitet wird, in denen ein weitestgehend homogenes elektrisches Feld besteht, also durch jene Kanäle, die sich innerhalb des von jeweils zwei benachbarten Elektrodenflächen begrenzten Raumbereiches des Wabenkörpers befinden.Claim 14 provides that those channels which are located outside of the area of the honeycomb body delimited by in each case two adjacent electrode surfaces are closed at least on the input side. As a result, the degree of separation can be improved, since in this way it is ensured that the exhaust gas flow is conducted only through those channels in which a largely homogeneous electric field exists, that is to say through those channels which are within the space area of the space bounded by two adjacent electrode surfaces Honeycomb body are located.
Eine Ausführung des Wabenkörpers, bei der insbesondere die Feinstruktur der Homogenität des elektrischen Feldes in den einzelnen Kanälen verbessert wird, kann mithilfe der Merkmale von Anspruch 15 erreicht werden, indem der lichte Querschnitt jener Kanäle, die sich innerhalb des von jeweils zwei benachbarten Elektrodenflächen begrenzten Raumbereiches des Wabenkörpers befinden, jeweils rechtecksförmig ausgebildet ist, wobei zwei normal zu den Elektrodenflächen aufeinander folgende Kanäle jeweils ziegelmauerartig gegeneinander versetzt sind. Eine weitere Erhöhung der strukturellen Stabilität kann durch die Maßnahmen von Anspruch 16 erreicht werden, indem jene Kanäle, die sich außerhalb des von jeweils zwei benachbarten Elektrodenflächen begrenzten Raumbereiches des Wabenkörpers befinden, einen kleineren lichten Querschnitt aufweisen, als jene Kanäle, die sich innerhalb des von jeweils zwei benachbarten Elektrodenflächen begrenzten Raumbereiches des Wabenkörpers befinden. Jene Abschnitte des Wabenkörpers, die sich außerhalb der Bereiche mit homogenem elektrischen Feld befinden, und somit bevorzugt nicht zur Filterung von Partikeln beitragen, sind somit dichter ausgeführt und tragen auf diese Weise zur Erhöhung der strukturellen Stabilität des Wabenkörpers bei. Dabei kann gemäß Anspruch 17 auch vorgesehen sein, dass der lichte Querschnitt jener Kanäle, die sich außerhalb des von jeweils zwei benachbarten Elektrodenflächen begrenzten Raumbereiches des Wabenkörpers befinden, quadratisch ausgeführt ist .An embodiment of the honeycomb body in which, in particular, the fine structure of the homogeneity of the electric field in the individual channels is improved can be achieved by the features of claim 15, by the clear cross-section of those channels which are within the space area delimited by in each case two adjacent electrode surfaces of the honeycomb body are formed, each rectangular in shape, wherein two normal to the electrode surfaces successive channels are each brick wall-like offset from each other. A further increase in structural stability can be achieved by the measures of claim 16, by Channels which are located outside the space region of the honeycomb body delimited by in each case two adjacent electrode surfaces have a smaller clear cross-section than those channels which are located within the space region of the honeycomb body delimited by in each case two adjacent electrode surfaces. Those portions of the honeycomb body which are outside the homogeneous electric field regions, and thus preferably do not contribute to the filtering of particles, are thus made denser and thus contribute to increasing the structural stability of the honeycomb body. It can also be provided according to claim 17, that the clear cross-section of those channels, which are located outside of the space bounded by two adjacent electrode areas of the honeycomb body, is square.
Um die Durchführung der metallischen Beschichtung zu erleichtern und dabei die strukturelle Stabilität nicht zu sehr zu beeinträchtigen, kann gemäß Anspruch 18 vorgesehen sein, dass jene Kanäle, die mit einem elektrischen Leiter versehen sind, dickere Innenwände sowie einen größeren lichten Querschnitt aufweisen, als andere Kanäle des Wabenkörpers.In order to facilitate the implementation of the metallic coating and not to affect the structural stability too much, may be provided according to claim 18 that those channels which are provided with an electrical conductor, have thicker inner walls and a larger clear cross-section than other channels of the honeycomb body.
Die erfindungsgemäße Vorrichtung erlaubt insbesondere die vorteilhaften Ausführungsformen gemäß Anspruch 19 und 20, nämlich dass der Wabenkörper eine konvexe bzw. trapezförmige Umfangslinie aufweist.The device according to the invention allows in particular the advantageous embodiments according to claim 19 and 20, namely that the honeycomb body has a convex or trapezoidal circumferential line.
Die Erfindung wird im Folgenden anhand der beiliegenden Figuren näher erläutert. Dabei zeigen dieThe invention will be explained in more detail below with reference to the accompanying figures. The show
Fig. 1 eine schematische Darstellung eines Querschnitts einer Ausführungsform einer erfindungsgemäßen Vorrichtung, wobei insbesondere horizontale und parallel zueinander verlaufende Elektrodenflächen ersichtlich sind, undFig. 1 is a schematic representation of a cross section of an embodiment of a device according to the invention, wherein in particular horizontal and mutually parallel electrode surfaces are visible, and
Fig. 2 eine Detailansicht von Fig. 1, wobei insbesondere die Anordnung der Kanäle, sowie die Beschichtung von Kanälen einer Kanalgruppe, die eine Elektrodenfläche definiert, ersichtlich ist .Fig. 2 is a detail view of Fig. 1, wherein in particular the arrangement of the channels, as well as the coating of channels of a channel group, which defines an electrode surface, can be seen.
Die Fig. 1 und 2 zeigen jeweils eine schematische Darstellung eines Querschnitts eines Wabenkörpers 7, vorzugsweise aus einem keramischen Material. Dabei ist jeweils ein Wabenkörper 7 mit konvexer, nämlich elliptischer Umfangslinie dargestellt, er könnte aber auch andere Querschnittsformen aufweisen, etwa eine Trapezform. Besonders für Ausführungsformen dieser Art stellt sich die erfindungsgemäße Weiterbildung als besonders vorteilhaft dar. Der Wabenkörper 7 kann monolithisch vorliegen, oder aber auch aus mehreren Teilstücken zusammengesetzt sein.1 and 2 each show a schematic representation of a cross section of a honeycomb body 7, preferably made of a ceramic material. In each case, a honeycomb body 7 is shown with a convex, namely elliptical circumferential line, but it could also have other cross-sectional shapes, such as a trapezoidal shape. Especially for embodiments of this kind, the development according to the invention is particularly advantageous. The honeycomb body 7 can be monolithic, or else composed of several sections.
Gemäß dem Stand der Technik würde der Wabenkörper 7 eine zentrische, zylindrische Bohrung aufweisen, in der eine Hochspannungselektrode angeordnet ist. Die Gegenelektrode würde sich an der Außenseite des Wabenkörpers 7 befinden. Eine solche Bohrung ist aber gemäß der erfindungsgemäßen Merkmale nicht mehr notwendig, stattdessen kann der Wabenkörper 7, wie in den Fig. 1 und 2 dargestellt ist, strukturell einheitlich ausgeführt sein.According to the prior art, the honeycomb body 7 would have a centric, cylindrical bore in which a high voltage electrode is arranged. The counter electrode would be located on the outside of the honeycomb body 7. However, such a bore is no longer necessary according to the inventive features, instead, the honeycomb body 7, as shown in FIGS. 1 and 2, be structurally uniform.
Der Wabenkörper 7 weist Kanäle 3,4,5 auf, die in Längsrichtung des Wabenkörpers 7 verlaufen, und etwa beidseitig an den Stirnseiten des Wabenkörpers 7 offen sind. Bei manchen Wabenkörpern 7, die in der Praxis Verwendung finden, sind die Kanäle 3,4,5 aber auch wechselseitig offen und geschlossen, sodass der Abgasstrom durch einen an der Eintrittsseite offenen, aber an dessen Austrittsseite verschlossenen Kanal 3,4,5 eintritt, und zum Verlassen des Wabenkörpers 7 durch die Innenwand des betreffenden Kanals 3,4,5 zum benachbarten Kanal 3,4,5, der an der Eintrittsseite verschlossen, aber an der Austrittsseite offen ist, hindurchtreten muss. Die Erfindung eignet sich aber prinzipiell für beide Ausführungsvarianten, also jene der beidseitig offenen, als auch der wechselseitig offenen Kanäle 3,4,5.The honeycomb body 7 has channels 3,4,5, which extend in the longitudinal direction of the honeycomb body 7, and are open on both sides on the end faces of the honeycomb body 7. In some honeycomb bodies 7, which are used in practice, the channels 3,4,5 but also mutually open and closed, so that the exhaust gas flow through an open at the inlet side, but closed at the outlet side channel 3,4,5, and for leaving the honeycomb body 7 by the Inner wall of the respective channel 3,4,5 to the adjacent channel 3,4,5, which is closed at the inlet side, but open at the outlet side, must pass. However, the invention is in principle suitable for both variants, ie those of the open on both sides, as well as the mutually open channels 3,4,5.
Erfindungsgemäß werden die Elektroden 1,2 jeweils durch eine Gruppe von Kanälen 4, in denen jeweils zumindest teilweise entlang ihrer axialen Erstreckung ein elektrischer Leiter 6 eingebracht ist, gebildet. Gemäß der in den Fig. 1 und 2 gezeigten Ausführungsform werden die Elektroden 1,2 jeweils durch eine Gruppe von Kanälen 4 gebildet, deren Innenwände jeweils entlang der axialen Erstreckung der Kanäle 4 zumindest teilweise mit einer metallischen Beschichtung 6 versehen sind. Wie bereits erwähnt wurde, stellen die beschichteten Innenwände der Kanäle 4 zwar prinzipiell dreidimensionale Anordnungen dar, der Querschnitt der Kanäle 4 ist im Vergleich zum Querschnitt des Wabenkörpers 7 allerdings sehr klein, sodass eine durch eine Kanalgruppe gebildete Elektrode hinsichtlich ihrer elektrischen Eigenschaften durch eine ebene Elektrodenfläche 1,2 approximiert werden kann. Wie insbesondere aus der Fig. 2 ersichtlich ist, werden die Gruppen von Kanälen 4 jeweils durch nebeneinander liegende Kanäle 4 gebildet, sodass durch jede Gruppe von Kanälen 4 eine ebene Elektrodenfläche 1,2 definiert wird. In diesem Fall von nebeneinander liegenden Kanälen 4 mit jeweils rechteckigem Querschnitt kann die Elektrodenfläche 1,2 etwa als jene Fläche gedacht werden, die durch die Längsachsen der jeweiligen Kanäle 4 definiert wird.According to the invention, the electrodes 1, 2 are each formed by a group of channels 4, in each of which an electrical conductor 6 is introduced at least partially along its axial extent. According to the embodiment shown in FIGS. 1 and 2, the electrodes 1, 2 are each formed by a group of channels 4 whose inner walls are at least partially provided with a metallic coating 6 along the axial extent of the channels 4. Although the coated inner walls of the channels 4 are in principle three-dimensional arrangements, the cross section of the channels 4 is very small compared to the cross section of the honeycomb body 7, so that an electrode formed by a channel group is characterized by a flat electrode surface with respect to its electrical properties 1,2 can be approximated. As can be seen in particular from FIG. 2, the groups of channels 4 are each formed by adjacent channels 4, so that a planar electrode surface 1, 2 is defined by each group of channels 4. In this case of adjacent channels 4 each having a rectangular cross-section, the electrode surface 1, 2 may be thought of as being approximately the area defined by the longitudinal axes of the respective channels 4.
Verfahren zur Herstellung der Beschichtung 6 sind bekannt, so kann die Beschichtung 6 etwa über elektrolytische Verfahren hergestellt werden, bei denen ein Draht in den zu beschichteten Kanal 4 eingezogen wird, und bei Anlegen einer Spannung metallische Ionen des Elektrolyts an der Innenwand des Kanals 4 abgeschieden werden. Für die metallische Beschichtung 6 können etwa Kupfer, Kupfer-Chrom-Schichten oder andere leitfähige Stoffe, die sich bei der Herstellung und beim Betrieb der erfindungsgemäßen Vorrichtung als geeignet erweisen, vorgesehen sein .Methods for producing the coating 6 are known, the coating 6 can be produced approximately by electrolytic processes in which a wire is drawn into the channel 4 to be coated, and when a voltage is applied metallic ions of the electrolyte are deposited on the inner wall of the channel 4. For the metallic coating 6, for example, copper, copper-chromium layers or other conductive substances, which prove to be suitable in the manufacture and operation of the device according to the invention, may be provided.
Wie aus der Fig. 1 ersichtlich ist, verlaufen die ebenen Elektrodenflächen 1,2 jeweils horizontal und parallel zueinander. Der Abstand zweier benachbarter Elektrodenflächen 1 und 2 beträgt vorzugsweise weniger als 40 mm, etwa 15-25 mm. Dadurch kann zwischen den Elektrodenflächen 1 und 2 ein homogenes elektrisches Feld sichergestellt werden, und zwar insbesondere in jenen Raumbereichen, die sich innerhalb des von jeweils zwei benachbarten Elektrodenflächen 1,2 begrenzten Raumbereiches des Wabenkörpers 7 befinden, der im folgenden auch als homogener Feldbereich bezeichnet wird.As can be seen from FIG. 1, the flat electrode surfaces 1, 2 each extend horizontally and parallel to one another. The distance between two adjacent electrode surfaces 1 and 2 is preferably less than 40 mm, about 15-25 mm. As a result, a homogeneous electric field can be ensured between the electrode surfaces 1 and 2, in particular in those spatial regions which are located within the space region of the honeycomb body 7 delimited by two adjacent electrode surfaces 1, 2, which is also referred to below as a homogeneous field region ,
Zwei benachbarte Elektrodenflächen 1 und 2 sind jeweils gegenpolig kontaktiert, wobei in der Fig. 1 etwa die Elektrodenfläche 1 geerdet ist, und die Elektrodenfläche 2 mit gepulster Hochspannung versorgt wird. Die erfindungsgemäße Vorrichtung ist aber auch bei Ausführungsvarianten anwendbar, bei denen zur Elektrodenfläche 2 eine Gleichspannung zugeführt wird.Two adjacent electrode surfaces 1 and 2 are each contacted opposite polarity, wherein in FIG. 1, approximately the electrode surface 1 is grounded, and the electrode surface 2 is supplied with pulsed high voltage. However, the device according to the invention is also applicable to embodiments in which a DC voltage is supplied to the electrode surface 2.
An einer Stirnseite des Wabenkörpers 7 sind elektrische Kontaktierungen (in den Fig. 1 und 2 nicht dargestellt) der Elektrodenflächen 1 angeordnet, wobei sich die elektrische Kontaktierung der jeweils benachbarten Elektrodenflächen 2 vorzugsweise an der gegenüberliegenden Stirnseite des Wabenkörpers 7 befindet. Die Kontaktierung der jeweiligen Elektrodenfläche 1,2 wird durch in die der betreffenden Elektrodenfläche 1,2 zugeordneten, metallisch beschichteten Kanäle 4 eingeschobene Metallbürsten gebildet, wobei in jeder der Kanäle 4 mindestens eine, vorzugsweise mehrere Metallborsten der Bürste eingeschoben sind.On one end side of the honeycomb body 7 electrical contacts (not shown in FIGS. 1 and 2) of the electrode surfaces 1 are arranged, wherein the electrical contacting of the respectively adjacent electrode surfaces 2 is preferably located on the opposite end side of the honeycomb body 7. The contacting of the respective electrode surface 1, 2 is carried out by metallically coated electrodes assigned to the respective electrode surface 1, 2 Channels 4 inserted metal brushes formed, wherein in each of the channels 4 at least one, preferably a plurality of metal bristles of the brush are inserted.
Um die Gefahr von Spannnungsüberschlägen zwischen zwei benachbarten Elektrodenflächen 1,2 zu vermeiden, ist es wie oben erwähnt vorteilhaft, wenn das der Kontaktierung gegenüberliegende Ende eines metallisch beschichteten Kanals 4 einen unbeschichteten Endbereich aufweist, der sich etwa über einen axialen Bereich von zumindest 10-20 mm erstreckt. Vorzugsweise ist das der Kontaktierung jeweils gegenüberliegende Ende eines mit einem elektrischen Leiter 6 versehenen Kanals 4 verschlossen .In order to avoid the risk of voltage flashovers between two adjacent electrode surfaces 1, 2, it is advantageous, as mentioned above, for the end of a metallically coated channel 4 facing the contacting to have an uncoated end region which extends over an axial region of at least 10-20 mm extends. Preferably, the contacting of each opposite end of a provided with an electrical conductor 6 channel 4 is closed.
Im Folgenden wird auf eine Ausführungsform des Wabenkörpers 7 eingegangen, der sich insbesondere hinsichtlich der strukturellen Stabilität und Belastbarkeit als besonders vorteilhaft erweist. So können jene Kanäle 3, die sich außerhalb des homogenen Feldbereichs befinden, einen kleineren lichten Querschnitt aufweisen, als jene Kanäle 4,5, die sich innerhalb des homogenen Feldbereichs befinden, sodass der Wabenkörper 7 in diesen Bereichen über eine dichtere Struktur verfügt. Der lichte Querschnitt dieser Kanäle 3, die sich außerhalb des homogenen Feldbereichs befinden, kann dabei auch quadratisch ausgeführt sein, was deren strukturelle Belastbarkeit zusätzlich erhöht. Jene Kanäle 4, die mit einer metallischen Beschichtung 6 versehen sind, können dickere Innenwände sowie einen größeren lichten Querschnitt aufweisen, als alle anderen Kanäle 3,5 des Wabenkörpers 7. Das erleichtert einerseits die Herstellung der metallischen Beschichtung 6, und stellt andererseits aufgrund der dickeren Innenwände auch deren strukturelle Belastbarkeit sicher. Wie insbesondere in der Fig. 2 ersichtlich ist, kann der lichte Querschnitt jener Kanäle 5, die sich innerhalb des homogenen Feldbereichs befinden, jeweils rechtecksförmig ausgebildet sein, wobei zwei normal zu den Elektrodenflächen 1,2 aufeinander folgende Kanäle 5 jeweils ziegelmauerartig gegeneinander versetzt sind. Diese Ausführung des Wabenkörpers verbessert insbesondere die Feinstruktur der Homogenität des elektrischen Feldes in den einzelnen Kanälen.In the following, an embodiment of the honeycomb body 7 is discussed, which proves to be particularly advantageous in terms of structural stability and load-bearing capacity. Thus, those channels 3 that are outside the homogeneous field area may have a smaller clear cross-section than those channels 4, 5 that are within the homogeneous field area, so that the honeycomb body 7 has a denser structure in these areas. The clear cross section of these channels 3, which are located outside the homogeneous field area, can also be made square, which additionally increases their structural strength. Those channels 4, which are provided with a metallic coating 6, may have thicker inner walls and a larger clear cross-section than all other channels 3,5 of the honeycomb body 7. This facilitates one hand, the production of the metallic coating 6, and on the other hand due to the thicker Inner walls also ensure their structural resilience. As can be seen in particular in FIG. 2, the clear cross-section of those channels 5 which are located within the homogeneous field region can each have a rectangular shape be formed, wherein two normal to the electrode surfaces 1,2 successive channels 5 are each brick wall-like offset from each other. This embodiment of the honeycomb body improves in particular the fine structure of the homogeneity of the electric field in the individual channels.
Jene Kanäle 3, die sich außerhalb des homogenen Feldbereichs des Wabenkörpers 7 befinden, können außerdem eingangsseitig, wahlweise auch ausgangsseitig, verschlossen sein. Dadurch kann der Abscheidegrad verbessert werden, da auf diese Weise sichergestellt wird, dass der Abgasstrom nur durch jene Kanäle 5 geleitet wird, in denen ein weitestgehend homogenes elektrisches Feld besteht.Those channels 3, which are located outside the homogeneous field region of the honeycomb body 7, can also be closed on the input side, optionally also on the output side. Thereby, the degree of separation can be improved, since in this way it is ensured that the exhaust gas flow is conducted only through those channels 5 in which a largely homogeneous electric field exists.
Mithilfe der erfindungsgemäßen Vorrichtung wird somit ein Filter zum Abscheiden von Russpartikel verwirklicht, der auch bei Wabenkörper 7, deren Querschnitt von einer kreis- bzw. kreisringförmigen Form abweicht, ein weitestgehend homogenes elektrisches Feld im Inneren des Wabenkörpers 7 ermöglicht. Des Weiteren ergeben sich keine Beschränkungen hinsichtlich der Größe des Wabenkörpers 7, da je nach Größe des Wabenkörpers 7 eine angepasste Anzahl an Elektrodenflächen 1,2 vorgesehen sein kann. Die Vorrichtung zeichnet sich dabei durch hohe strukturelle Stabilität und Belastbarkeit aus. With the aid of the device according to the invention, a filter for separating soot particles is thus realized, which also enables a largely homogeneous electric field in the interior of the honeycomb body 7 even with honeycomb bodies 7 whose cross section deviates from a circular or annular shape. Furthermore, there are no restrictions on the size of the honeycomb body 7, since, depending on the size of the honeycomb body 7, an adapted number of electrode surfaces 1, 2 can be provided. The device is characterized by high structural stability and resilience.

Claims

Patentansprüche : Claims:
1. Vorrichtung zum Abscheiden von Russpartikel aus einem Abgasstrom mit einem keramischen Wabenkörper (7) mit vom Abgas durchströmbaren und in Längsrichtung des Wabenkörpers verlaufenden Kanälen (3,4,5), wobei der Wabenkörper (7) mit Elektroden zur Erzeugung eines elektrischen Feldes, das jeweils quer zur Achse der Kanäle1. A device for separating soot particles from an exhaust gas stream with a ceramic honeycomb body (7) with exhaust gas flowing through and extending in the longitudinal direction of the honeycomb body channels (3,4,5), wherein the honeycomb body (7) with electrodes for generating an electric field, each transverse to the axis of the channels
(3,4,5) orientiert ist, versehen ist, dadurch gekennzeichnet, dass die Elektroden jeweils durch eine Gruppe von Kanälen (4), in denen jeweils zumindest teilweise entlang ihrer axialen Erstreckung ein elektrischer Leiter (6) eingebracht ist, gebildet werden.(3,4,5) is oriented, is provided, characterized in that the electrodes in each case by a group of channels (4), in each of which at least partially along its axial extent an electrical conductor (6) is introduced, are formed.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Elektroden jeweils durch eine Gruppe von Kanälen (4), deren Innenwände jeweils entlang der axialen Erstreckung der Kanäle (4) zumindest teilweise mit einer metallischen Beschichtung (6) versehen sind, gebildet werden.2. Device according to claim 1, characterized in that the electrodes in each case by a group of channels (4), the inner walls are each provided along the axial extent of the channels (4) at least partially with a metallic coating (6) are formed.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Gruppen von Kanälen (4) jeweils durch nebeneinander liegende Kanäle (4) gebildet werden, sodass durch jede Gruppe von Kanälen (4) eine ebene Elektrodenfläche (1,2) definiert wird.3. Device according to claim 1 or 2, characterized in that the groups of channels (4) are each formed by adjacent channels (4), so that by each group of channels (4) a planar electrode surface (1,2) is defined ,
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die ebenen Elektrodenflächen (1,2) jeweils parallel zueinander sind.4. Apparatus according to claim 3, characterized in that the planar electrode surfaces (1,2) are each parallel to each other.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass zwei benachbarte Elektrodenflächen (1,2) einen Abstand von unter 40 mm aufweisen. 5. Apparatus according to claim 4, characterized in that two adjacent electrode surfaces (1,2) have a spacing of less than 40 mm.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass zwei benachbarte Elektrodenflächen (1,2) einen Abstand von 15-25 mm aufweisen.6. Apparatus according to claim 5, characterized in that two adjacent electrode surfaces (1,2) have a spacing of 15-25 mm.
7. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Gruppen von Kanälen (4) jeweils durch nebeneinander liegende Kanäle (4) gebildet werden, sodass durch jede Gruppe von Kanälen (4) eine gekrümmte, vorzugsweise zylinderförmige, Elektrodenfläche (1,2) definiert wird.7. The device according to claim 1 or 2, characterized in that the groups of channels (4) are each formed by adjacent channels (4), so that through each group of channels (4) has a curved, preferably cylindrical, electrode surface (1, 2) is defined.
8. Vorrichtung nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, dass jeweils zwei benachbarte Elektrodenflächen (1,2) gegenpolig kontaktiert sind.8. Device according to one of claims 3 to 7, characterized in that in each case two adjacent electrode surfaces (1,2) are contacted opposite pole.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass sich die elektrische Kontaktierung einer Elektrodenfläche (1) an einer Stirnseite des Wabenkörpers (7) befindet, und die elektrische Kontaktierung der jeweils benachbarten Elektrodenflächen (2) an der gegenüberliegenden Stirnseite des Wabenkörpers (7) .9. The device according to claim 8, characterized in that the electrical contacting of an electrode surface (1) on an end face of the honeycomb body (7), and the electrical contacting of the respective adjacent electrode surfaces (2) on the opposite end face of the honeycomb body (7). ,
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Kontaktierung der jeweiligen Elektrodenfläche (1,2) durch in die der betreffenden Elektrodenfläche (1,2) zugeordneten, mit einem elektrischen Leiter (6) versehenen Kanäle (4) eingeschobene Metallbürsten gebildet wird, wobei in jeder der Kanäle (4) mindestens eine, vorzugsweise mehrere Metallborsten der Bürste eingeschoben sind.10. The device according to claim 9, characterized in that the contacting of the respective electrode surface (1,2) by in the respective electrode surface (1,2) associated, with an electrical conductor (6) provided with channels (4) inserted metal brushes is formed , wherein in each of the channels (4) at least one, preferably a plurality of metal bristles of the brush are inserted.
11. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass das der Kontaktierung gegenüberliegende Ende eines mit einem elektrischen Leiter (6) versehenen Kanals (4) einen vom Leiter (6) freien Endbereich aufweist.11. The device according to claim 9 or 10, characterized in that the contacting opposite end of a provided with an electrical conductor (6) channel (4) has an end region free of the conductor (6).
12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Endbereich eine axiale Erstreckung von zumindest 10-20 mm aufweist .12. The device according to claim 11, characterized in that the end region has an axial extent of at least 10-20 mm.
13. Vorrichtung nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, dass das der Kontaktierung jeweils gegenüberliegende Ende eines mit einem elektrischen Leiter13. Device according to one of claims 9 to 12, characterized in that the contacting of each opposite end of one with an electrical conductor
(6) versehenen Kanals (4) verschlossen ist.(6) provided channel (4) is closed.
14. Vorrichtung nach einem der Ansprüche 3 bis 13, dadurch gekennzeichnet, dass jene Kanäle (3), die sich außerhalb des von jeweils zwei benachbarten Elektrodenflächen (1,2) begrenzten Raumbereiches des Wabenkörpers (7) befinden, zumindest eingangsseitig verschlossen sind.14. Device according to one of claims 3 to 13, characterized in that those channels (3) which are located outside of each of two adjacent electrode surfaces (1,2) limited space region of the honeycomb body (7) are closed at least on the input side.
15. Vorrichtung nach einem der Ansprüche 3 bis 14, dadurch gekennzeichnet, dass der lichte Querschnitt jener Kanäle15. Device according to one of claims 3 to 14, characterized in that the clear cross section of those channels
(5) , die sich innerhalb des von jeweils zwei benachbarten Elektrodenflächen (1,2) begrenzten Raumbereiches des Wabenkörpers (7) befinden, jeweils rechtecksförmig ausgebildet ist, wobei zwei normal zu den Elektrodenflächen (1,2) aufeinander folgende Kanäle (5) jeweils ziegelmauerartig gegeneinander versetzt sind.(5), which are located within each of two adjacent electrode surfaces (1,2) limited space region of the honeycomb body (7), each having a rectangular shape, with two normal to the electrode surfaces (1,2) successive channels (5) each brick wall are offset from each other.
16. Vorrichtung nach einem der Ansprüche 3 bis 15, dadurch gekennzeichnet, dass jene Kanäle (3), die sich außerhalb des von jeweils zwei benachbarten Elektrodenflächen (1,2) begrenzten Raumbereiches des Wabenkörpers (7) befinden, einen kleineren lichten Querschnitt aufweisen, als jene Kanäle (5), die sich innerhalb des von jeweils zwei benachbarten Elektrodenflächen (1,2) begrenzten Raumbereiches des Wabenkörpers (7) befinden.16. Device according to one of claims 3 to 15, characterized in that those channels (3) which are located outside of each of two adjacent electrode surfaces (1,2) limited space region of the honeycomb body (7) have a smaller clear cross-section, as those channels (5) that are within each of two adjacent electrode surfaces (1,2) limited space area of the honeycomb body (7) are located.
17. Vorrichtung nach Anspruch 16, dadurch gekennzeichnet, dass der lichte Querschnitt jener Kanäle (3), die sich außerhalb des von jeweils zwei benachbarten Elektrodenflächen (1,2) begrenzten Raumbereiches des Wabenkörpers (7) befinden, quadratisch ausgeführt ist.17. The apparatus according to claim 16, characterized in that the clear cross section of those channels (3) which are located outside of each of two adjacent electrode surfaces (1,2) limited space region of the honeycomb body (7), is square.
18. Vorrichtung nach einem der Ansprüche 2 bis 17, dadurch gekennzeichnet, dass jene Kanäle (4), die mit einem elektrischen Leiter (6) versehen sind, dickere Innenwände sowie einen größeren lichten Querschnitt aufweisen, als andere Kanäle (3,5) des Wabenkörpers.18. Device according to one of claims 2 to 17, characterized in that those channels (4) which are provided with an electrical conductor (6) have thicker inner walls and a larger clear cross-section than other channels (3,5) of the honeycomb body.
19. Vorrichtung nach einem der Ansprüche 1 bis 18, dadurch gekennzeichnet, dass der Wabenkörper (7) eine konvexe Umfangslinie aufweist.19. Device according to one of claims 1 to 18, characterized in that the honeycomb body (7) has a convex circumferential line.
20. Vorrichtung nach einem der Ansprüche 1 bis 18, dadurch gekennzeichnet, dass der Wabenkörper (7) eine trapezförmige Umfangslinie aufweist. 20. Device according to one of claims 1 to 18, characterized in that the honeycomb body (7) has a trapezoidal circumferential line.
PCT/EP2006/060895 2005-06-08 2006-03-21 Device for removing soot particles from an exhaust gas stream WO2006131406A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE502006007485T DE502006007485D1 (en) 2005-06-08 2006-03-21 DEVICE FOR SEPARATING RUSSIAN PARTICLES FROM AN EXHAUST GAS
EP06725183A EP1891310B1 (en) 2005-06-08 2006-03-21 Device for removing soot particles from an exhaust gas stream
US11/921,423 US7776140B2 (en) 2005-06-08 2006-03-21 Device for removing soot particles from an exhaust gas stream
AT06725183T ATE475001T1 (en) 2005-06-08 2006-03-21 DEVICE FOR SEPARATING SOOT PARTICLES FROM AN EXHAUST STREAM

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0096705A AT501888B1 (en) 2005-06-08 2005-06-08 WAVE FILTER WITH PLANAR ELECTRODES
AT967/2005 2005-06-08

Publications (1)

Publication Number Publication Date
WO2006131406A1 true WO2006131406A1 (en) 2006-12-14

Family

ID=36607303

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/060895 WO2006131406A1 (en) 2005-06-08 2006-03-21 Device for removing soot particles from an exhaust gas stream

Country Status (5)

Country Link
US (1) US7776140B2 (en)
EP (1) EP1891310B1 (en)
AT (2) AT501888B1 (en)
DE (1) DE502006007485D1 (en)
WO (1) WO2006131406A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008138023A1 (en) * 2007-05-10 2008-11-20 Fleck Carl M Regulation of a plasma-regenerated soot filter
AT509854A4 (en) * 2010-07-22 2011-12-15 Fleck Carl M Dr CONTROL OF A PLASMAREGENERATED SOIL FILTER

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110009659A (en) * 2008-03-25 2011-01-28 인바이런멘탈 에너지 테크놀로지스 인코포레이티드 Non-thermal plasma particulate reduction systems and methods of use thereof
DE102009041090A1 (en) 2009-09-14 2011-03-24 Emitec Gesellschaft Für Emissionstechnologie Mbh Apparatus and method for treating exhaust gas containing soot particles
DE102009041092A1 (en) * 2009-09-14 2011-03-24 Emitec Gesellschaft Für Emissionstechnologie Mbh Exhaust treatment device with two honeycomb bodies for generating an electrical potential
WO2020101913A1 (en) * 2018-11-16 2020-05-22 Corning Incorporated Plugged honeycomb bodies, extrusion dies and method of manufacturing thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897096A (en) * 1986-03-15 1990-01-30 Fev Motorentechnik Gmbh & Co. Kg. System for the regeneration of a particulate filter trap
FR2779177A1 (en) * 1998-05-29 1999-12-03 Renault Active regeneration particle filter for exhaust gas from an automobile internal combustion engine.
EP1229992A1 (en) * 1999-11-10 2002-08-14 Carl Maria Prof. Dr. Fleck Filter system for separating soot particles from a stream of exhaust gas
JP2003049632A (en) * 2001-08-03 2003-02-21 Nippon Kouatsu Electric Co Particulate matter removing method and its device

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58199018A (en) * 1982-05-18 1983-11-19 Nippon Denso Co Ltd Purifying device equipped with electrically heating means for fine particle contained in waste gas
US4979364A (en) 1988-03-11 1990-12-25 Fleck Carl M Diesel fuel exhaust gas filter
DE3830977A1 (en) * 1988-09-12 1990-03-15 Fev Motorentech Gmbh & Co Kg FILTER ARRANGEMENT FOR REMOVING SOOT PARTICLES FROM EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE
JP2931362B2 (en) * 1990-04-12 1999-08-09 日本碍子株式会社 Resistance control type heater and catalytic converter
GB2245670A (en) 1990-06-27 1992-01-08 Ford Motor Co A pipe coupling
JP2898364B2 (en) * 1990-07-06 1999-05-31 日本碍子株式会社 Electrode integrated honeycomb heater and method for manufacturing the same
JP3001281B2 (en) * 1991-03-06 2000-01-24 日本碍子株式会社 Honeycomb monolith heater
US5259190A (en) * 1991-08-01 1993-11-09 Corning Incorporated Heated cellular structures
US5449541A (en) * 1992-10-27 1995-09-12 Corning Incorporated Electrically heatable honeycomb structures
CA2147112A1 (en) * 1994-05-26 1995-11-27 Kishor Purushottam Gadkaree Electrically heatable activated carbon bodies for adsorption and desorption applications
US5681373A (en) * 1995-03-13 1997-10-28 Air Products And Chemicals, Inc. Planar solid-state membrane module
WO1997002410A1 (en) * 1995-07-06 1997-01-23 Fleck Carl M Soot filter, in particular for diesel engine exhaust gases
US5714228A (en) * 1995-12-18 1998-02-03 General Motors Corporation Ceramic catalytic converter substrate
ATA24696A (en) 1996-02-12 2000-10-15 Fleck Carl M Dr DEVICE FOR PURIFYING EXHAUST GASES FROM INTERNAL COMBUSTION ENGINES
AT2330U1 (en) 1997-06-17 1998-08-25 Fleck Carl M Dr DEVICE FOR DISSOCIATING NITROGEN OXIDES CONTAINED IN THE EXHAUST GAS FROM COMBUSTION ENGINES
US6290757B1 (en) * 1999-03-26 2001-09-18 Ceramphysics, Inc. Nitrogen purification device
DE10003816A1 (en) * 2000-01-28 2001-08-02 Opel Adam Ag Renewable particle filter for removing soot particles from exhaust gases
US20030041730A1 (en) * 2001-08-30 2003-03-06 Beall Douglas M. Honeycomb with varying channel size
AT500959B1 (en) 2004-11-09 2007-05-15 Carl M Dr Fleck METHOD AND FILTER ARRANGEMENT FOR SEPARATING RUSSIAN PARTICLES

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897096A (en) * 1986-03-15 1990-01-30 Fev Motorentechnik Gmbh & Co. Kg. System for the regeneration of a particulate filter trap
FR2779177A1 (en) * 1998-05-29 1999-12-03 Renault Active regeneration particle filter for exhaust gas from an automobile internal combustion engine.
EP1229992A1 (en) * 1999-11-10 2002-08-14 Carl Maria Prof. Dr. Fleck Filter system for separating soot particles from a stream of exhaust gas
JP2003049632A (en) * 2001-08-03 2003-02-21 Nippon Kouatsu Electric Co Particulate matter removing method and its device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 06 3 June 2003 (2003-06-03) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008138023A1 (en) * 2007-05-10 2008-11-20 Fleck Carl M Regulation of a plasma-regenerated soot filter
AT509854A4 (en) * 2010-07-22 2011-12-15 Fleck Carl M Dr CONTROL OF A PLASMAREGENERATED SOIL FILTER
AT509854B1 (en) * 2010-07-22 2011-12-15 Fleck Carl M Dr CONTROL OF A PLASMAREGENERATED SOIL FILTER

Also Published As

Publication number Publication date
US7776140B2 (en) 2010-08-17
EP1891310B1 (en) 2010-07-21
AT501888B1 (en) 2006-12-15
EP1891310A1 (en) 2008-02-27
AT501888A4 (en) 2006-12-15
ATE475001T1 (en) 2010-08-15
US20090101016A1 (en) 2009-04-23
DE502006007485D1 (en) 2010-09-02

Similar Documents

Publication Publication Date Title
EP1891310B1 (en) Device for removing soot particles from an exhaust gas stream
EP3552710B1 (en) Electrostatic filter unit and extraction hood device with electrostatic filter unit
DE2209089B2 (en) HIGH VOLTAGE ELECTRIC DEVICE
DE102012109391A1 (en) Electrically heatable, extruded from ceramic material honeycomb body
EP0581784A1 (en) Electrically heatable honeycomb body
EP1971757B1 (en) Method and device for reducing the number of particles in the exhaust gas of an internal combustion engine
DE2236854A1 (en) SPACER FOR GAS INSULATED HIGH VOLTAGE CABLES
DE202017107554U1 (en) Fluid treatment device, electrode grid therefor and assembly of a plurality of such electrode grid
WO2010112144A1 (en) Battery housing having a sealing plate
DE10229881B4 (en) Plasma particulate filter
DE4413118A1 (en) Gas-cleaning apparatus
DE102009041091A1 (en) Device for the treatment of soot particles containing exhaust gas
EP3066700B1 (en) Piezoelectric transformer and counter electrode
DE3238794C2 (en)
WO2023012166A1 (en) Air filter comprising an electrostatic precipitator
EP1375851A1 (en) Plasma reactor, method for manufacturing the same and installation for treating exhaust gas of combustion engines
WO1998046360A1 (en) Electrostatic filter
AT395827B (en) Process for burning aerosols, especially soot, contained in waste gases
EP2616181B1 (en) Device for producing an electric field in an exhaust gas system
DE202013012520U1 (en) Device for welding electrical conductors
DE102013104396A1 (en) Electrochemical storage device
DE10334348A1 (en) Rainfall pipes for wet electrostatic precipitators
WO1999003591A1 (en) Installation for purifying electrically nonconductive liquids, in particular vegetable oils
DE102009059933A1 (en) Method for agglomeration of particles in exhaust gas system of internal combustion engine, involves guiding exhaust gas by electric field that is generated in device for agglomeration
DD266284A1 (en) SPRUEHIELD ELECTRODE CONFIGURATION FOR ELECTRIC DUST SEPARATION

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2006725183

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 11921423

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

WWP Wipo information: published in national office

Ref document number: 2006725183

Country of ref document: EP